/* *****************************************************
 * Copyright (c) 2025 Google, Inc.  All rights reserved.
 * *****************************************************/
/*
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are met:
 *
 * * Redistributions of source code must retain the above copyright notice,
 *   this list of conditions and the following disclaimer.
 *
 * * Redistributions in binary form must reproduce the above copyright notice,
 *   this list of conditions and the following disclaimer in the documentation
 *   and/or other materials provided with the distribution.
 *
 * * Neither the name of Google, Inc. nor the names of its contributors may be
 *   used to endorse or promote products derived from this software without
 *   specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED. IN NO EVENT SHALL VMWARE, INC. OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
 * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
 * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH
 * DAMAGE.
 */


/***************************************************************************
 * assembly utilities
 */

#include "cpp2asm_defines.h"

START_FILE

#ifdef LINUX
/*
 * Signature: raw_syscall(sysnum, num_args, arg1, arg2, ...)
 */
        DECLARE_FUNC(raw_syscall)
GLOBAL_LABEL(raw_syscall:)
/*
 * x8 = syscall number
 * x0..x6 = syscall arguments
 */
        cmp      w1,#7
        mov      x8,x0
        mov      x0,x2
        mov      x1,x3
        mov      x2,x4
        mov      x3,x5
        mov      x4,x6
        mov      x5,x7
        /* We set up first 6 args unconditionally, but read 7th arg from stack
         * only if there are at least 7 args.
         */
        b.cc     1f
        ldr      x6,[sp]
1:
        svc      #0
        ret
        END_FUNC(raw_syscall)
#endif

END_FILE
